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Fine Minerals for Sale from Butte, Montana

Friday, 23 December 2016 06:00 PM

Rare Mineral Specimens from the Butte District in Montana. Read all about Butte mining history, geology and minerals.

Colusite

with Pyrite - #45858
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
Cu12V(Sb,As,Sn)3S16 
Availability
Sold
Size
5.5 x 3.5 x 2 cm - Sm Cabinet 
Tagged
sulfide , copper , tin , vanadium  

Very nice, well-formed Colusite crystals to 2mm on Enargite crystals with fabulous Pyrite to 1.8cm. Colusite usually is found massive, these are complex crystals with silvery to brassy reflection and occurs as Bideaux first reported in 1960. This is a remarkable specimen by all standards.


Colusite

Formula
Cu12V(Sb,As,Sn)3S16 
Crystal System
Isometric 
Crystal Habit
Massive - Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
bronze 
Streak
black 
Class
Isometric - Hextetrahedral 
Fracture
Brittle 
Hardness
3-4 
Collection
Chris van Laer Collection
On Dakota Matrix
Previously Sold Colusite
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Covellite

with Pyrite - #45926
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
CuS 
Availability
Sold
Size
3 x 2.5 x 2 cm - Thumbnail 
Tagged
sulfide , copper  

This is a very nicely crystallized combination specimen with purple or indigo thin platy crystals of Covellite to 6mm. The Covellite crystals are seperated well and nicely defined. The overall group is 1.5cm wide. The matrix is mostly Pyrite showing good crystals to 4mm.


Covellite

Formula
CuS 
Crystal System
Hexagonal 
Crystal Habit
Platy, Foliated 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
indigo blue, light blue, dark blue, black 
Streak
black gray 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Brittle 
Hardness
1.5-2 
Collection
Chris van Laer Collection
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Covellite

#45935
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
CuS 
Availability
Sold
Size
5 x 4.5 x 3 cm - Miniature 
Tagged
sulfide , copper  

Metallic purple hexagonal crystal plates to 4mm composing nearly the entire matrix.


Covellite

Formula
CuS 
Crystal System
Hexagonal 
Crystal Habit
Platy, Foliated 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
indigo blue, light blue, dark blue, black 
Streak
black gray 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Brittle 
Hardness
1.5-2 
Collection
Chris van Laer Collection
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Djurleite

#45933
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
Cu31S16 
Availability
Sold
Size
4.5 x 3 x 2 cm - Miniature 
Tagged
sulfide , copper  

Very well-formed Djurleite crystals from 3-4mm. It may also be Digenite as noted on Chris van Laer's collection card. Whichever the case, it is an excellent specimen with sharp, well-formed crystals. 


Djurleite

Formula
Cu31S16 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Tabular, Massive - Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
lead gray, blue black, black, black gray 
Streak
metallic 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
2.5-3 
Collection
Chris van Laer Collection

Enargite

#45847
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
Cu3AsS4 
Availability
Sold
Size
4 x 3.5 x 2.5 cm - Miniature 
Tagged
sulfide , copper  

Brilliant silvery black, sharp Enargite crystals to 1.2cm. Most all of the crystals are nicely terminated. Great cluster.


Enargite

Formula
Cu3AsS4 
Crystal System
Orthorhombic 
Crystal Habit
Euhedral Crystals, Massive - Granular, Prismatic 
Cleavage
Perfect, Distinct, Distinct 
Luster
Metallic 
Color
steel gray, blackish gray, violet black 
Streak
black 
Class
Orthorhombic - Pyramidal 
Fracture
Uneven 
Hardness
Collection
Chris van Laer Collection
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Enargite

with Pyrite and Quartz - #45860
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
Cu3AsS4 
Availability
Sold
Size
5.5 x 5 x 4 cm - Sm Cabinet 
Tagged
sulfide , copper  

There are several Enargite crystals on this specimen, not just the large one center left, which is 9mm. The Enargite is all well formed, striated and terminated with the typical Enargite terminations. In the hood are also dozens of brassy yellow octahedral crystals of Pyrite to 2mm and needle Quartz.


Enargite

Formula
Cu3AsS4 
Crystal System
Orthorhombic 
Crystal Habit
Euhedral Crystals, Massive - Granular, Prismatic 
Cleavage
Perfect, Distinct, Distinct 
Luster
Metallic 
Color
steel gray, blackish gray, violet black 
Streak
black 
Class
Orthorhombic - Pyramidal 
Fracture
Uneven 
Hardness
Collection
Chris van Laer Collection
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